Toro 570 series

I have Toro 570 series pop ups ( 4'x30' side strip) spray sprinklers along either side of my driveway. There is Liriope planted along either side of the driveway also... very pretty, but the pop-ups aren't tall enough to pop over the Liriope and water the plantings behind it also! Can I replace the pop-up with 12"? What product would you suggest? Can I just unscrew the old pop-ups and screw in the new ones, or is it more complicated than that?! I think there will still be enough water placed on the Liriope if I keep the same spray head... or would you suggest a different spray head as well?
Sorry about all the questions, but I don't want to mess up the system! Thanks! :I

Hey,
Several things you can do!
1. Dont apologize for the questions. i hear ya
2. use Toro 570
3. Are these pop ups in the lawn or in a garden. If they are in a lawn, you will have to use funny pipe and dig the heads down, if they are in a garden, you can unscrew the small head and put in a new on. Make sure you replace the whole thing and not just the internals